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A return value of 0 from Python-level `ioctl()` means success, but if that's returned unconditionally it means that the method supports all ioctl calls, which is not true. Returning 0 without doing anything can potentially lead to a crash, eg for MP_STREAM_SEEK which requires returning a value in the passed-in struct pointer. This commit makes it so that all `ioctl()` methods respond only to MP_STREAM_CLOSE, ie they return -1 (indicating error) for all other ioctl calls. Signed-off-by: Damien George <damien@micropython.org>